IBM 1130 User Manual page 452

OPTICAL HEADERS
The IBM 1231 Optical Mark Page Header reads
positional marks made by an ordinary lead pencil
on paper documents, such as test scoring sheets,
etc. The data contained on these documents can be
IBM 1231 Optical Mark Page Reader
Section Subsections Page
45
40
I
00
read into the 1130 system at a rate of 2000 sheets
per hour.
01
The 1231 is especially suited for applications
such as examination grading, surveys, order entry,
etc., where variable information may be entered by
hand on preprinted forms.